Attached is the revised network diagram. It got a little cluttered when I moved connections. I moved the ITC-5 to the middle of the backbone and put the power in there. I added an E22158 and connected the i70, P70, and ST60 to it and have a terminator on the end. Not clear what cable I will use from the ST60 to the converter. The other backbone terminator is on the 5 way connector. The two MFDs attach to the backbone with drop cables. Sorry for the messiness in the middle. I hope to start pulling cables on Friday. At 78 this new technology is not as easy to learn as it was at 22!

Chuck,
I have made the line changes in the attached PDF. Now there are two connections to each MFD - one hs cable and one ng drop cable. Is this correct?
I do not understand your comment about changes in colors for the lines. The colors I use seem to be what you are recommending. What am I missing?
Thanks again for sticking with me on this.
Randy

The SeaTalk to SeaTalkng Converter Kit is supplied with a cable having a plug which is designed to be mated to the press-fit 3-pin SeaTalk socket of ST60 Instruments. Should this cable not be sufficiently long enough, then it may be mated to a D244 SeaTalk Junction Block which may then be joined to the ST60 Instrument via an appropriate length of SeaTalk cable having press-fit 3-pin SeaTalk plugs on each end.